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1411 - Buffering of inputs to expect, and match order
If you're using the expect command to wait for one of a series of inputs within your expect program, information will be checked in the program's internal buffers inthe following order: a) Any string that matches expect_before will be found b) Matches to each of the possible patterns in expect in t ....

1410 - Tcl / regsub - changing a string and using interesting bits
Regexp matches a string to a regular expression, and regsub goes one further in that it replaces the found string with something else, saving the transformed output into a new variable. But what if I want the output pattern to include part of the string that was matched? I can refer to the "inter ....

1409 - What is Expect?
Expect is an extension to the Tcl language which provides three key new commands - spawn which lets you start up another process, send which lets you send information to that process and expect through which you can receive back responses from that process. For the majority of users of Tcl, Expect ....

1408 - Wireless hotel tips - FTP and Skype connections failing
I'm on line this week through a Spectrum interactive account, who's web site tells me that they have won a contract to supply BAA at Heathrow Terminal 5 and that they have an exclusive 7 year deal at Travelodge, where I have been staying. It's not all been a bed of roses - quite apart from a major ....

1407 - Reading from another process in Tcl (pipes and sockets)
If you want to read from another process on the same system that you're running your code on in Tcl can be done using a pipe - you can use open with the command name instead of the file name, preceeded by a pipe character (|) - thus: set said [open |df r]   while {[gets $said this] >= 0} { &nb ....

1406 - Away or home - which do I prefer?
The hotel is spartan and the staff unfriendly. The Wifi didn't work and the support company was informative about the problems, but passing the buck on to others and not able to actually fix the issues for many hours. The restaurant had unset / unwiped tables all over, with food smeared on the menus ....

1405 - Sorting in Tcl - lists and arrays
Tcl's lsort command lets you sort a list - and that can be a list of the keys of an array. You can't sort the array, but once you have the list of keys you can sort that and use it to iterate through the array in any order that you like. As everything (except an array) is a string in Tcl, when you ....

1404 - Tcl - global, upvar and uplevel.
In Tcl, variables are "scoped" to the procedure in which they're used. That's a sensible default, since you want to be able to write main applications without the risk of interfering with variables within your procs. A global command in a proc allows you to refer to a variable in the main code fro ....

1403 - Square Bracket protection in Tcl
I was writing some string match examples in Tcl yesterday - and had the need to explicitly match square brackets within my string. But I couldn't just write the square brackets into the match string ... • The square bracket first needed protection from the Tcl parser before it even got to th ....

1402 - Tcl - append v lappend v concat
Should you use append, lappend or even concat to add to variable in Tcl? append puts one string directly on the end of another, without adding any extra characters beyond those in the incoming variables. lappend treats the target string as a list, and will usually add an extra space on the end of ....

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